polled socket system. This much more cleanly and efficiently integrates peer
(and other server to server) connections into the normal server I/O framework
and should also eliminate for good the annoying server hangs that result when
our old blocking client I/O threads got their pants wedged.
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(which runs on the server) that we do in a normal client (which runs on a
user's computer). Eventually we'll make a custom Communicator for use on the
server that integrates with the ConnectionManager's polled socket I/O which
will be easier now that this bit of factoring has been done.
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MetaSOY clients (Swiftly, World, and soon Admin Dashboard) don't have to know
about a bunch of unrelated crap. Fricking complexity++, grumble.
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We need to set up the preference interval (but not start it) before we try to open the connection. Otherwise, we won't have it around if we get a shutdown call during that opening (which can and does happen).
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required some serious bending and folding of the generic type system, but for
the most part we managed to avoid any mutilating. The gendobj task now
generates properly typed "addToXXX" and "updateXXX" DSet methods based on the
parameterized type of the DSet. This might cause unrecompiled code to break,
but I don't think there are many cases in the base toolkit where people call
DSet adders or updaters. We'll see and I'll add backwards compatibility
versions for cases where we need them to support GG games (everything else we
can just recompile).
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make connections to other servers in the cluster and can exchange events (in a
limited fashion).
This is different than Liz's project wherein servers share an oid space and one
can interchangably work with distributed objects from any server. This package
provides a means by which certain services (by default, presence and chat) can
be communicated between servers to allow communication between players
scattered around a bunch of otherwise independent server instances.
This is less general purpose but also less likely to encourage people to write
code that tightly couples multiple servers and then falls over because it
generates gobs of network traffic as events are flung willy nilly behind the
scenes.
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synchronization problems and decided it would be a lot easier to just fix them.
The interval thread and the communication writer thread need to be properly
coordinated to avoid funny business.
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on multiple ports, falling back from one to the next as appropriate.
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genericize Narya data structures, nor make the existing code type safe. That's
going to be an extremely large project.
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completely cleaned up so that an immediate attempt to logon using a
different configuration will not fail due to the client thinking it's
still logged on from the previous failed attempt.
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that authentication is processed on the dobjmgr thread rather than
requiring the caller to do the right thing (or not as the case happened to
be).
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condition between the omgr thread and the conmgr thread. Now when the omgr
thread processes an event that is going out to the clients, it flattents
the message itself for each client that is to receive the message and the
flattened data is posted to the conmgr outgoing queue.
This means that once an event is finished processing, no further
modifications to any of the data associated with the event can effect the
data queued up to be sent to the client. This is a good thing, it will
eliminate or illuminate a very baffling class of bugs that we've sort of
been ignoring because we knew this could be the cause.
We used to take an event and flatten it directly into the direct buffer
from which we would do our socket write. Now we flatten it into a
temporary byte array. This means a metric shitload more garbage generation
and collection. We used to do the flattening on the conmgr thread, now we
do it on the omgr thread. This means a big redistribution of CPU demand.
Either of those things could result in a significant negative impact on
our performance, but we'll just have to deploy this stuff and find out.
Whee! If it turns out to be a serious problem, there are potential
optimizations that could be done by keeping a pool of direct buffers
around and flattening messages into them, relying on the fact that the
outgoing conmgr queue generally doesn't grow too large and we could
allocate tens to a hundred megabytes of memory for the outgoing queue if
we really needed to.
I'd also like to test the overflow handling stuff more. It didn't really
change in that everything just deals with arrays of bytes now instead of
unflattened messages, but I'll be more comfortable once I've seen all this
in action on ice where there may be few users, but they are just as likely
to experience lag and receive an overflow queue as users on the higher
traffic servers. There is code to log when overflow queues are created and
finally flushed and how much use they got while they were around, so that
should give us an indication of whether things are operating properly.
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the first 80 characters if this every actually discovers an anomaly rather
than just dutifully reporting every time someone updates really lengthy
crew news.
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together in one JVM and both interoperate with the AWT thread in a manner
so harmonious as to bring a tear to the eye. This was surprisingly much
easier that I expected, thanks to my eminently sensible initial design,
I'm sure. ;)
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classloader to use when unserializing objects off the network. Also fixed
the way custom classloaders were used as Class.forName(class, true,
loader) seems to be the proper way to go to have caching work and whatnot.
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Windows where it wigs out and behaves as if the connection was reset by
the peer ("An existing connection was forcibly closed by the remote host")
if one writes messages bigger than about 25k. I can't imagine how we would
be sending such big messages to the server, but it's worth a check.
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seconds to pass in between ping/pong latency samples. Additionally, we
resync the clock every 10 minutes.
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the server in 90 seconds. The client is set up to ping the server if it
has had nothing to say to it for other reasons in the last 60 seconds.
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after both the reader and writer have exited (otherwise the reader could
exit before the writer which would result in the client chucking its
reference to the communicator which could subsequently bite us in the ass
if anyone tried to reference the client's distributed object manager when
the writer finally exited and triggered all of the clientDidLogoff
callbacks). Multithreaded programming is fun!
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Dave Hoover